Sleep

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General




  • https://en.wikipedia.org/wiki/Hypnagogia - also referred to as "hypnagogic hallucinations", is the experience of the transitional state from wakefulness to sleep: the hypnagogic state of consciousness, during the onset of sleep. (For the transitional state from sleep to wakefulness see hypnopompic.) Mental phenomena that may occur during this "threshold consciousness" phase include lucid thought, lucid dreaming, hallucinations and, sleep paralysis. However, sleep paralysis and lucid dreaming are separate sleep conditions that are sometimes experienced during the hypnagogic state.
  • https://en.wikipedia.org/wiki/Hypnic_jerk - hypnagogic jerk, sleep start, sleep twitch or night start is an involuntary twitch which occurs when a person is beginning to fall asleep, often causing them to awaken suddenly for a moment. Physically, hypnic jerks resemble the "jump" experienced by a person when startled, sometimes accompanied by a falling sensation. Hypnic jerks are associated with a rapid heartbeat, quickened breathing, sweat, and sometimes "a peculiar sensory feeling of 'shock' or 'falling into the void'".[3] A higher occurrence is reported in people with irregular sleep schedules.


  • https://en.wikipedia.org/wiki/Somnolence - alternatively "sleepiness" or "drowsiness", is a state of near-sleep, a strong desire for sleep, or sleeping for unusually long periods (cf. hypersomnia). It has two distinct meanings, referring both to the usual state preceding falling asleep, and the chronic condition referring to being in that state independent of a circadian rhythm. "Somnolence" is derived from the Latin "somnus" meaning "sleep."